From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4A20DC1975A for ; Tue, 17 Mar 2020 21:56:25 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1C69020752 for ; Tue, 17 Mar 2020 21:56:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="EhvzxCIe"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="n+jfY58+" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1C69020752 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=HfAGSE1jsizecWo8gEs8vB7nLG1dbKOUE04ufpbNQqQ=; b=EhvzxCIehr7zOa tftdX2O6XqpcQzdi51U2d62U+hg08W8MZbWG3g/SZd9c5729ly/sYUA7v4TFyKVdbKQAnlgMXVWbk zw5Nne/0TPs5gflfZfEBMmPzppGnmqhcIaj1FOzzjBL1cns/E/SdzaoMXZbZUYbD7x4IM+UeZ1LbE jZHdkfAQJ8Hl3rmz+IjnpMRzrnq1HzXrzk8cvPOfc+qvDzOMVw0WCEXKdP8002jy/8gkzbJO/w5MQ PAYpFMnq7Hk9uD9AUSo8rH3MDtLu2x8GmCRFZEa5KrsT19gYDYzZIiPdirHanlZuLezQaN2+V3SQ1 54OLmTKei0R+NHOe4akA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jEKCF-0002V9-Ux; Tue, 17 Mar 2020 21:56:23 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jEKCC-0002UX-QO for linux-arm-kernel@lists.infradead.org; Tue, 17 Mar 2020 21:56:22 +0000 Received: from willie-the-truck (236.31.169.217.in-addr.arpa [217.169.31.236]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id E421420724; Tue, 17 Mar 2020 21:56:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584482180; bh=ltu6nAB3cqjUcyzN/b/tv8nLp/YUwPWjD/rDtUy+sgk=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=n+jfY58+O3gxLesJbYsTqizSa2RR6XLi3KOzJTD9QCVRkf2N2Vb/4Egzsdk/L4b5b CP91bT2bOG+axRpAPBNen9T7gdpGU4eqbWfc5APbhlKH3xrtmf+fdXJN+ndAQyj+K2 eWeHzI67pC4vnqYjNGg2gteEqMyW7yXWzsIKxNmc= Date: Tue, 17 Mar 2020 21:56:14 +0000 From: Will Deacon To: Kees Cook Subject: Re: [PATCH 7/9] arm64/build: Warn on orphan section placement Message-ID: <20200317215614.GB20788@willie-the-truck> References: <20200228002244.15240-1-keescook@chromium.org> <20200228002244.15240-8-keescook@chromium.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200228002244.15240-8-keescook@chromium.org> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200317_145620_873336_051A78B4 X-CRM114-Status: UNSURE ( 9.92 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , "H.J. Lu" , Arnd Bergmann , linux-kbuild@vger.kernel.org, Catalin Marinas , Masahiro Yamada , x86@kernel.org, Russell King , linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, James Morse , linux-arch@vger.kernel.org, Borislav Petkov , Peter Collingbourne , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Feb 27, 2020 at 04:22:42PM -0800, Kees Cook wrote: > We don't want to depend on the linker's orphan section placement > heuristics as these can vary between linkers, and may change between > versions. All sections need to be explicitly named in the linker > script. > > Explicitly include debug sections when they're present. Add .eh_frame* > to discard as it seems that these are still generated even though > -fno-asynchronous-unwind-tables is being specified. Add .plt and > .data.rel.ro to discards as they are not actually used. Add .got.plt > to the image as it does appear to be mapped near .data. Finally enable > orphan section warnings. Hmm, I don't understand what .got.plt is doing here. Please can you elaborate? Will _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel